1) SOUTH BOSTON — The new incarnation of Molly Moo's opened on Sunday, just in time for the annual St. Patrick's Day Parade in Southie. In addition to dozens of flavors of Christina's Homemade Ice Cream and an espresso drink menu, Molly Moo's also offers ice cream sandwiches, light breakfast items, and — in honor of the season — Shamrock shakes and green bagels. Status: Certified open. 687 East Second St., Boston. 774-225-1003.
2) LYNN — An 88-seat outpost of R.F. O'Sullivan & Son opened in Lynn over the weekend. The new burger joint is "the exact same" as its Somerville sibling, which means visitors should expect a couple dozen varieties of belly-busting burgers that are never squished down on the grill, thick-cut fries, craft beer, and other pub fare. The Lynn location has something new: a double-sided fireplace. Status: Certified open. 143 Central Ave.
3) CHINATOWN — There's a new place in town for assorted duck parts. Duck King has opened in the Avana Sushi food court, according to a poster on Chowhound. The new shop offers duck heads, necks, feet, organs, and more. Status: Certified open. 42 Beach St., Boston.
4) MALDEN — Elsewhere in food courts, David's BBQ Restaurant is now serving Chinese and Cantonese cuisine in the 99 Asian Market in Malden. Status: Certified open. 60 Broadway St., Malden. 617-952-9681.